Air-heater.



` No. 802,046. PATENTED 00T. 17, 1905. A. S. KIEFER. AIR HEATER.

APPLICATION FILED JUNE 27.1904.

/NVENIQH el Amm/v5 YJ l la El' l 1111111 49 UNTTED sTATEs ADAM S. KIEFER, OF CLEVELAND, OHIO.

AIR-HEATER.

Specification of Letters Patent.

Patented Oct. 17, 1905.

Application filed Tune 27, 1904. Serial No. 214,300.

To @ZZ whom, t may con/cern:

Beit known that I, ADAM S. KIEFER, a citizen of the United States of America, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Air-Heaters; and I,v

hereby declare the following to be a full, clear, and exact description of the invention. such as will enable others skilled in the art to which it pertains to make and use thesame.

This invention relates to improvements in air-heaters, and pertains more especially to a heater designed for burning natural gas.

The object of this invention is to construct an air-heater of the character indicated which is simple and durable in construction, which has a great air-heating capacity, and in which the products of combustion are advantageously utilized.

With this object in view thisinvention consists in certain features of construction and combinations and arrangement of parts hereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure l is a rear side elevation, largely in central verticalsection, of an air-heater embodying my invention. Fig. 2 is a vertical section on line 2 2, Fig. l, looking in the direction indicated by the arrow. Fig. 3 is a top plan in section on line 3 3, Fig. l. Fig. 4L is a vertical section in detail on line 44, Fig. 3. y

The upright walls of the casing of my improved air-heater are formed by vertically-arranged metal plates A. The heater has a top B, which is preferably composed of a single casting and rests upon the upper edges of the plates or walls A, which top is provided next the innersides of the said plates or walls with depending ianges The plates A rest upon a base-plate or bottom C, which is pr?)v vided with upwardly-projecting flanges c next the outer sidesof the plates or walls A. The base-plate or bottom C of the heater is provided with legs 8 and is composed, preferably, of a single casting. The parts A, B, and C are assembled and held together in any approved manner. The front of the heatercasing is provided with a doorway 7, normally closed by a suitably-applied door D. The said front is also shown provided near the bottom with air-holes 6.

The interior 'chamber 10 of the casing, formed by the plates or walls A, top B, and

arranged horizontally.

lbottom C, centrally between the top and bottom, contains a heating-burner G, which is The chamber l2 of the burner isl in communication, preferably centrally and at the bottom, with the pipe H employed in conducting the inflammable gas or fluid fuel to the burner.

Air-conducting Hues K are arranged vertically'and a suitable distance apart laterally within the lower portion of the chamber l0, and the burner Gr is suitably supported from the said iiues. Each flue K rests at its lower end upon the base-plate or bottom C. Each iiue K communicates at its lower end with the atmosphere exteriorly of the heater through an aperture or hole 15, with which the baseplate or bottom C is provided centrally of the lower end of the said Hue.

The upper end of each flue K terminates in an upwardly-tapering and u pwardly-projecting vertically-arranged nozzle 7c. Each nozzle extends vertically through the burnerchamber l2, but is preferably formed integral with the burner.

The burnerG is provided in the top Wall of its chamber l2 with as many apertures or holes 16 as there are nozzles /t to accommodate the location of the said nozzles and the discharge of air by the nozzles upwardly into the fiames issuing' from the burner around the nozzles during the operation of the burner. The surrounding wall or walls of each aperture or hole 16 are provided with recesses 17, which form orifices communicating with the burnerchamber l2 and discharging upwardly.

The chamber l0 of the heater-casing is provided within its upper portion with as many downwardly-tapering air-iues L as there are air-fines K. The upper air-flues L are preferably integral with and depend from the top B of the stove-casing and communicate at their upper ends with the atmosphere eX- teriorly of the heater. The flues L depend into the nozzles r of the iiues K-that is, each Hue L depends into a nozzle 70 and preferably snugly fits within the upper end of the said nozzle.

The lo-Wer portion of each Hue L is provided eXteriorly with grooves or recesses 20, which extendy longitudinally of the said flue and are arranged at suitable intervals around the fines. The surrounding Wall of the chamber of each nozzle it' is provided with recesses IOO 22, arranged at suitable intervals around the nozzle and extending longitudinally of the nozzle from the lower end to the upper extremity of the nozzle, and the said recesses in the said nozzle preferably alternate with the recesses 20, formed in the air-flue depending into the said nozzle. The recesses 2O in the dues L and the recesses 22 in the nozzles /c form the air-outlets of the air-flues K.

By the construction hereinbefore described it will be observed that the nozzles t are prevented from being overheated, that ample air is supplied to the flames issuing from the burner around the air-flues L to properly support the combustion, that the said flames impinge against the exterior of the flues L, that the iiues L are in communication at their lower ends with the lower air-flues K, and that air passes from within the iues K into the flues L and is heated within the last-mentioned iues, that the air heated within the lines L ascends into the atmosphere exterior] y of the heater, and that the upward Hare of the flues L facilitates the escape of heated air from the flues.

I would here remark that the burner is preferably provided with discharge-orifices 13 in addition to the orifices 17; but the lastmentioned orifices are the main dischargeorifices of the burner.

The chamber l0 of the heater-casing is provided at the rear of the heater with an outlet 25 (see Fig. 2) for the products of combustion, from which outlet the said products are conducted off in any approved manner.

What I claim isl. An air-heater comprising an upright lower air-flue communicating at its lower end with the atmosphere exteriorly of the heater and terminating at its upper end in an upwardly projecting and upwardly tapering nozzle; an upright upper air-flue depending into the aforesaid nozzle and communicating at its lower end with the lower flue and at its upper end with the atmosphere exteriorly of the heater, with the lower portion of the upper flue provided in its exterior with recesses which are spaced around and arranged Alongitudinallyof the said Hue and form air-outlets for the lower flue; a burner extending and discharging upwardly around but only externally of the nozzle, and means for supplying the burner-chamber with fluid fuel, and the said nozzle being integral with the burner.

2. An airheater comprising an upright lower air-flue communicating at its lower end with the atmosphere exteriorly of the heater and terminating at its upper end in an upwardly projecting and upwardly tapering nozzle, with theupwardly-tapering portion of lthe nozzle provided interiorly with upwardlydischarging recesses; an upright upper airiue depending into and communicating with the aforesaid nozzle and communicating at its lower end with the lower flue and at its upper end with the atmosphere exteriorly of the heater, with the lower portion of the upper iiueprovided in its exterior with upwardlydischarging recesses alternating with the aforesaid recesses in the nozzle; a burner extending and discharging upwardly around but only externally of the nozzle, and means for supplying the burner-chamber with iiuid fuel.

3. An airheater comprising an upright lower air-liuc communicating at its lower end with the atmosphere exteriorly of the heater and terminating at its upper end in an upwardly tapering and upwardly projecting nozzle, with the wall or walls of the chamber of the said nozzle provided with suitablyspaced recesses which extend from the lower end to the upper extremity of the nozzle; an upright upper air-flue depending into the upper portion of the aforesaid nozzle and communicating at its lower end with the lower flue and atl its upper end with the atmosphere exteriorly of the heater; a burner extending around the nozzle and discharging upwardly in proximity to but only externally of the nozzle, and means for supplying the burner with fluid fuel.

4C. An air-heater comprising an upright lower air-flue communicating at its lower end with the atmosphere exteriorly of the heater, and terminating at its upper end in an upwardly projecting and upwardly tapering nozzle; an upright upper air-flue depending into the upper portion of the aforesaid nozzle and communicating at its lower end with the lower flue and at its upper end with the atmosphere exteriorly of the heater, with the lower portion of the upper iiue tapering downwardly and provided in its exterior with recesses which are spaced around and arranged longitudinally of the said fine; a burner extending around the nozzle and discharging upwardly in proximity to but only exteriorly of the nozzle, and means for supplying the burner with fluid fuel.

5. An air-heater comprising an upright lower air-Hue communicating at its lower end with the atmosphere exteriorly of the heater and terminating at its upper end in an upwardly-projecting nozzle, .with the wall or walls of the chamber of the said nozzle provided with recesses which extend from the lower end to the upper extremity of the nozzle and are arranged at suitable intervals around the nozzle; an upright Lipper air-flue depending into and snugly filling the uppeil portion of the aforesaid nozzle and communicating at its lower end with the lower flue and at its upper end with the atmosphere exteriorly of the heater, with the lower portion of the upper flue tapering downwardly and provided in its exterior with recesses which IOO IIO

are spaced around and arranged longitudil In testimony whereof I sign the foregoing nally of the said flue and alternate with the specification in the presence of two witnesses. recesses in the nozzle; a burner extending around the nozzle and discharging upwardly 5 in proximity to but only externally of the Witnesses-z nozzle. and means for supplying the burner C. H. DORER, with iuid fuel. G. M. HAYES.

ADAM s. KIEFER. 

